Cheapest return flights from Washington to Porto in May from $605
AirHint found the following cheapest return flights from Washington (IAD) to Porto (OPO) in May 2025 (see full year).
Return flights
Also check the deals for one-way flights from Washington to Porto in May.
The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.
